Fire alarm



FIG. 1 is a bottom perspective view of a fire alarm showing my new design;

FIG. 2 is a top perspective view thereof:

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof, the rear elevational view being a mirror image.

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a right side elevational view thereof, the left side being a mirror image.

The parts shown in broken lines are for illustrative purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a fire alarm, as shown and described. 